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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 119,002 $ 118,944 $ 110,876
Derivative, Amount of Hedged Item 299 315  
Loans and Finance Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 393 359  
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 76,600 76,843  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 65,663 65,793 63,013
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Derivative, Amount of Hedged Item 34 43  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 10,937 11,050 10,675
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 8,331 8,294  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 26 30  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | One year and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Two years and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 37.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Three years and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 42.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Four years and nine months, or greater [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | nine months or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 3.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 2,606 2,756  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 653 714  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | One year and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 2.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Two years and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Three years and nine months, or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Four years and nine months, or greater [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 1.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | nine months or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 17.00%    
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 42,402 42,101 $ 37,188
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 34,911 35,041  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross 3,499 3,248  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Gross $ 3,992 $ 3,812